The tunnel-face Side Slope at Houziyan hydropower station is one hundred and eighty meters high. Because of the high and steep slope brought by excavation, its stability greatly influenced the running of water diversion system. Based on the survey of crack characteristics and geological conditions of the slope, we studied the rock mass structure style and the combination of characters of structure planes, faults, slope surface. We calculated the stability coefficient with different crack combinations for the tunnel-face side slope with rigid limit equilibrium method. We assessed the stability of the slope.%猴子岩进水口洞脸边坡高约180m,由于开挖所形成的边坡属于高陡边坡,其开挖后的稳定状况会极大影响引水系统的正常运行.通过对该边坡平洞揭露裂隙特征及地表工程地质条件的系统调查,对边坡的岩体结构类型及其结构面、断层与坡面组合特征进行了细致研究,在此基础上对可能的滑面组合采用刚体极限平衡法进行计算.最后对边坡的安全稳定性进行了评价.
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